Globoturborotalita cancellata


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita cancellata
Sister taxa: G. tenella, G. rubescens, G. decoraperta, G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi, G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides, G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, G. martini, G. ouachitaensis, G. sp.,

Taxonomy

Citation: Globoturborotalita cancellata (Pessagno, 1963)
Rank: species
Basionym: Globigerina ampliapertura cancellata Pessagno, 1963
Synonyms:

 

Taxonomic discussion:

Globoturborotalita cancellata apparently is a little known or overlooked species among Oligocene workers probably due to its low numbers in samples. Pessagno (1963) considered this species as a subspecies of Turborotalia ampliapertura, however, in agreement with Blow (1969) and Jenkins (1971) we consider these forms to be unrelated. Blow (1979) suggested this species was referrable to Dentoglobigerina, however, our studies of the wall texture and aperture morphology indicate it belongs in Globoturborotalita. [Spezzaferri et al. 2018]

Catalog entries: Globigerina ampliapertura cancellata

Type images:

Distinguishing features:

Low trochospiral, globular, 3½-4 chambers in final whorl, increasing rapidly in size. The last chamber forms ca. ⅓ of the test. Umbilicus large, open. Aperture umbilical, a low rounded arch, with a thin rim

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters:

Globoturborotalita cancellata differs from G. paracancellata by the more lobulate profile, by the more gradual increase in chamber size in the ultimate whorl; in G. paracancellata the final chamber represents approximately half the size of the test, compared with a third in G. cancellata. Globoturborotalita pseudopraebulloides is more loosely coiled, has a more rapid rate of final whorl chamber size increase and is generally larger than G. cancellata (see discussion below). It is distinguished from Subbotina cancellata Blow from the lower Paleocene by the less strongly cancellate less asymmetrical cancellate wall and more highly arched and umbilical centered aperture. Globoturborotalita cancellata is distinguished from Subbotina eocaena and Dentoglobigerina taci, with which it shares similar gross test morphology, by the coarser cancellate wall texture (see Chapter 11, this volume, for discussion and SEM images of D. taci), more open, rounded and umbilical position of the aperture (compared to S. eocaena), more rounded form of the final chamber. [Spezzaferri et al. 2018]


Wall type: Normal perforate, spinose, sacculifer-type wall, pore concentrations average 22 pores/50 μm2 test surface area.

Test morphology: Low trochospiral, globular, consisting of 3 whorls. The profile is lobulate, with globular chambers; in spiral view 3½-4 globular, slightly embracing chambers in ultimate whorl, increasing rapidly in size. The last chamber generally consists of a third of the test. The sutures are depressed, slightly curved; in umbilical view 3½-4 globular, slightly embracing chambers, increasing rapidly in size, sutures depressed, slightly curved, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a low rounded arch, bordered by a thin thickened rim; in edge view chambers globular, slightly embracing, initial whorl slightly elevated. [Spezzaferri et al. 2018]

Size: Maximum diameter of holotype 0.28 mm, minimum diameter 0.26 mm, maximum width 0.2 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.5-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: We have identified specimens from low to middle latitude localities. [Spezzaferri et al. 2018]

Isotope paleobiology: No data available. [Spezzaferri et al. 2018]

Phylogenetic relations: Globoturborotalita cancellata probably evolved from Globoturborotalita bassriverensis. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita bassriverensis - at confidence level 3 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Globoturborotalita occlusa; Globoturborotalita paracancellata;

Biostratigraphic distribution

Geological Range:
Notes: Zone E16 to O5? [Spezzaferri et al. 2018]
Last occurrence (top): within O5 zone (26.93-28.09Ma, top in Chattian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within E16 zone (33.90-34.68Ma, base in Priabonian stage). Data source: Spezzaferri et al. 2018

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.228

References:

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

Pessagno, E. A. (1963). Planktonic foraminifera from the Juana Díaz Formation, Puerto Rico. Micropaleontology. 9: 53-60. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46: 231-269. gs


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Globoturborotalita cancellata compiled by the pforams@mikrotax project team viewed: 22-8-2019

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